doc: Fix the Doxygen section endings

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/include/osmocom/gsm/protocol/gsm_08_58.h b/include/osmocom/gsm/protocol/gsm_08_58.h
index b6a5dd8..10c201d 100644
--- a/include/osmocom/gsm/protocol/gsm_08_58.h
+++ b/include/osmocom/gsm/protocol/gsm_08_58.h
@@ -556,6 +556,6 @@
 	RSL_MRPCI_PHASE_2PLUS	= 3,
 };
 
-/*! }@ */
+/*! @} */
 
 #endif /* PROTO_GSM_08_58_H */